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Composition and Method for Therapeutic Agent Delivery During Pregnancy

a technology of therapeutic agents and delivery methods, applied in the direction of peptide/protein ingredients, fusions for specific cell targeting, peptide sources, etc., can solve the problems of severe adverse effects on the developing fetus, and achieve the effect of reducing the amount of therapeutic agents that cross the placenta

Active Publication Date: 2016-10-13
UNIV OF MISSISSIPPI MEDICAL CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a composition that can be used to deliver a therapeutic agent to a pregnant subject. The composition includes an elastin-like polypeptide (ELP) coupled to the therapeutic agent. The ELP is designed to reduce the amount of the therapeutic agent that crosses the placenta in the pregnant subject. The ELP can be administered to the pregnant subject in different ways, such as through a vein, and can be targeted to specific organs such as the kidneys, placenta, or brain. The therapeutic agent can be a peptide, antibiotic, or small molecule drug. The technical effect of this invention is to provide a safer and more effective method for delivering therapeutic agents to pregnant subjects.

Problems solved by technology

Many therapeutic agents that are otherwise safe for an adult will cross the placental barrier in pregnant mothers and cause severe adverse effects on the developing fetus.

Method used

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  • Composition and Method for Therapeutic Agent Delivery During Pregnancy
  • Composition and Method for Therapeutic Agent Delivery During Pregnancy
  • Composition and Method for Therapeutic Agent Delivery During Pregnancy

Examples

Experimental program
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example 1

Design and Method for Generation of ELP-Fusion Polypeptides

[0088]ELP sequences were made by recursive directional ligation. A synthetic nucleotide cassette containing the coding sequence for 5 to 10 VPGXG repeats with the desired amino acids at the X position and flanked by PflMI and BlgI restriction sites was cloned into the pUC19 vector at the EcoRI and HinDIII sites. The sequence of this construct was confirmed by DNA sequencing using standard M13 forward and reverse primers. Once one block of 5 to 10 VPGXG repeats was inserted and confirmed, it was excised from pUC19 using PflMI and BglI restriction digestion and purified using agarose electrophoresis. A second aliquot of pUC19 containing the VPGXG repeated sequence was linearized by digestion with PflMI only, and the gel purified cassette was ligated into the PflMI restriction site. This resulted in an in-frame fusion of the block of 5-10 VPGXG repeats with a second block of 5 to 10 VPGXG repeats, effectively doubling the numbe...

example 2

Recombinant Expression and Purification of Polypeptides

[0090]ELPs and ELP fusion proteins were expressed and purified from E. coli BLR (DE3) or Rosetta2®(DE3) (for constructs resulting from human cDNA containing human-optimized codons). Briefly, 500 mL of TB Dry liquid culture media (MoBio) was inoculated with the expression strain and cultured at 37° C. with 250 rpm agitation for 16-18 h. In the absence of the pLysS lysozyme-expressing plasmid, the pET expression system allows for leaky production of the recombinant protein even without inducing agents. Bacteria were harvested by centrifugation and lysed by sonication (10×10 sec pulses, 75% amplitude, Fisher Sonic Dismembrator). Cell debris was removed by centrifugation, and nucleic acids were precipitated with 10% polyethylene imine and removed by centrifugation. NACl was added to the soluble bacterial lysate to lower the ELP transition temperature (4 g / 30 mL), and the lysate was heated to 42° C. to induce aggregation of the ELP-c...

example 3

Use of ELP for Drug Delivery During Pregnancy

[0091]In order to test the hypothesis that ELP-fused therapeutics do not cross the placenta, an experiment was performed using the unmodified ELP carrier. Pregnant Sprague Dawley rats on day 14 of gestation were injected with fluorescently labeled ELP (100 mg / kg IV). Four hours after injection, which is about one half-life for this polypeptide, the rats were sacrificed and the placentas, pups, and major organs were removed for examination. Placentas and pups were dissected from the amniotic sacks and imaged ex vivo using an IVIS Spectrum animal imager to detect and quantitate the ELP levels. As shown in FIG. 2A, the placentas of animals injected with ELP-Alexa633 stained brightly, indicating that much protein had accumulated in them. In contrast, almost no ELP was detectable in the pups. The image intensities of the placentas, pups, and major organs were quantitated using Living Image software, and the results are shown in FIG. 2B. ELP ac...

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Abstract

A composition including an elastin-like polypeptide (ELP) coupled to a therapeutic agent is provided. The ELP comprises at least about 5 repeats of the amino acid sequence VPGXG. Further provided is a method of using the composition for therapeutic agent delivery during pregnancy to reduce the amount of the therapeutic agent crossing a placenta in a pregnant subject. The method includes administering to the pregnant subject an effective amount of the composition comprising the ELP coupled to the therapeutic agent.

Description

RELATED APPLICATIONS[0001]This application claims priority from U.S. Provisional Application Ser. No. 61,885,300, filed Oct. 1, 2013, the entire disclosure of which is incorporated herein by this reference.STATEMENT OF GOVERNMENT SUPPORT[0002]This presently-disclosed subject matter was made with government support under grant number NIH R01HL121527 awarded by National Institutes of Health. The government has certain rights in it.TECHNICAL FIELD[0003]The presently-disclosed subject matter relates to a composition and method for therapeutic agent delivery during pregnancy. More particularly, the presently-disclosed subject matter relates to a composition comprising an elastin-like polypeptide (ELP) coupled to a therapeutic agent and a method of using the composition to reduce an amount of the therapeutic agent crossing the placenta in a pregnant subject.INTRODUCTION[0004]Special considerations must be taken when giving drug therapies to pregnant mothers. Not only must normal concerns ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07K14/78C07K7/08A61K38/17C07K14/47A61K38/18C07K14/49
CPCC07K14/78A61K38/1866C07K14/49C07K2319/33C07K14/4703C07K7/08C07K2319/00A61K38/1709A61K38/005A61K47/6435A61P9/12
Inventor BIDWELL, III, GENE L.GEORGE, ERIC M.
Owner UNIV OF MISSISSIPPI MEDICAL CENT
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